Steam Humidifiers
Whole-house steam humidifiers from Aprilaire (800, 800LC, 801, 865 and the ductless 866), GeneralAire GF5500, Trion ComfortSteam CFS20 and CFS22, and the Honeywell Home Advanced Electrode Humidifier, with outputs from 11 to 34.6 gallons a day. Steam parts such as TrueSTEAM valves and switches, canister O-rings and distributor manifolds are here too.
Need a replacement canister? Shop steam cylinders, or browse all whole house humidifiers and Aprilaire humidifiers.
Steam humidifier guide: how they work and choosing one ▾
How a steam humidifier works
A steam humidifier boils water in a canister (cylinder) and sends the steam into your ductwork or, for ductless models like the Aprilaire 866, straight into the room through a fan pack. Because it makes its own steam, its output does not depend on how hot your furnace air is, which makes steam a common choice for heat pumps and high-efficiency furnaces and for larger homes.
Choosing a model
- Output: listed in gallons per day (GPD). The models here range from 11 GPD (Honeywell Home, 11 GPD setting) to 34.6 GPD (Aprilaire 801 and 866); the Trion CFS20 is 11.5 GPD and the CFS22 23 GPD.
- Voltage: check what your home supplies. The Trion CFS20 is 115V and the CFS22 is 230V; check each listing for the others.
- Water: the Aprilaire 800LC is built for low-conductivity water. If you are unsure about your water, ask your installer.
Canisters and maintenance
Steam canisters wear out as minerals build up and need replacing over time; follow the manufacturer's schedule and match the canister to your humidifier model. Steam humidifiers connect to water, drain and electrical supplies, so have them installed by a licensed HVAC technician and electrician.
